Percentage Calculator
Solve every common percentage question instantly.
What is X% of Y?
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X is what % of Y?
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Percentage change
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Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
Read the privacy policyHow this calculation works
Understand the method, inputs and limits behind your result.
- Formula
- Part = total × percentage / 100. Percentage = part / total × 100. Percentage change = (new − old) / old × 100.
- Variables
- Part = portion of a total
- Total = reference value
- Old and new = starting and ending values
- Units
- Percentage: %; compared values must use the same unit.
- Example
- 15% of 200 = 30. An increase from 100 to 120 is 20%.
- Assumptions
- A percentage or percentage change requires a nonzero reference denominator.
- Source
- ToolzHive calculation guide and calculator implementation. External reference verification is pending.
- Last reviewed
- Implementation review; specialist review has not been recorded.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Percentage Calculator
Calculate a percentage of a value, one value as a percentage of another, or percentage change.
- 1 Choose the panel that matches your question.
- 2 Enter X and Y, or the From and To values.
- 3 Read the result and verify that the baseline is the one you intended.
Example and practical tips
A change from 80 to 100 is a 25% increase, while 20% of 100 is 20.
Frequently asked questions
Are percentage change and percentage points the same?
No. A rate moving from 10% to 15% increases by five percentage points but by 50% relative to the original rate.
What if the baseline is zero?
A relative percentage using zero as the denominator is undefined. Choose another way to describe that change.
Practical guides
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How to Use Percentage Calculator
Calculate percentages online: what is X% of Y, X as a percent of Y, and percentage increase or decrease between two values. Free percentage calculator.
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